Hand brake



May 7, 71935- s. B. HASELTINE 2,000,078

HAND BRAKE I OrigiQ/nal Filed Augjl, 1930 Il f/F /llll/Illl,

L/ @Mig Patented May 7, 1935 AUNITED STATES kHAND BRAKE VStacy B.Haseltine, Chicago, Ill., assignor to H. Miner, Inc., Chicago, Ill., acorporation of Delaware Original application'August 1, 1930, Serial No.

Patent No. 1,931,655, dated October Divided and this applicationSeptember 22, V1933, Serial No. 690,521

4 Claims.

This invention relates to improvements in hand brakes.

rThis application is a division of my application, Serial No. 472,218,led August l, 1930, on which i Patent No. 1,931,655, dated October 24,1933, has

been granted. Y

, One object of theinvention is to provide, in a hand brake mechanismincluding a chain-winding drum, simple kand efficient meansfor arrestingthe unwinding movement of the chain-winding drum in a predeterminedposition when the brakes are released.

Another object of the invention is to provide, in a brake mechanism ofthe character indicated in the preceding paragraph, means for positivelystoppingl the unwinding movement of the chain-winding drum when thebrakes are released and so positioning the pivot connection of the chainwith the drum that quick take-up of the slack in the brake chain isveffected immediately when the drum is rotated inA chain-windingdirection.

A still further object of the invention is to provide stop means of thecharacter described in the preceding paragraph, which is especiallydesigned for operation in connection with a chainwinding drum havingmore than one turnof the chain wound thereon in the chain-tighteningoperation.

Yet another object of the invention is to provide a stop means whicheffectively stops the rotation of the drumof a hand brake mechanism whenthe brakes are quickly released so as to prevent reverse winding. of thechain thereon, which might otherwise occur due to the momentum of therotation of the drum.

Other objects of the invention will more clearly appear from thedescription and claims hereinafter following.

In the drawing, forming a part of this specication, Figure 1 is avertical sectional view of a hand brake mechanism, illustratingmyimprovements in connection therewith. Figure 2 is a vertical sectionalView, on an enlarged scale, corresponding substantially to the'line 2-2of Figure l, said view being partly broken away.

In said drawing the hand brake mechanism is shown as mounted on thevertical end wall III of a railway car and is enclosed within a two-parthousing comprising sections I2 and I3. The section I2 forms the coverplate of the housing and the section I3 the housing proper. The sectionI3 is provided with securing lugs I4-I4 by which the same is fixed tothe end wall of the car. The housing section I3 is divided into twocompart- Ycable therewith and is yieldingly held in its ex- (Ci.zar-149) ments by a vertically disposed partitionwall I1 at right anglesto the plane of the end ofthe car. At the right-hand end, as viewedv inFigure k1', the housing hasa side wall 20, which is provided with anoutwardly projecting closed boss 2l'. At the inner end, the boss2l isprovided with a bearing opening22 which receives and forms a journalmember for the inner end of a shaft 23 on which thechain-winding drum AVis mounted. The `opposite end of the' shaft 23 has a cylindricalportion24,.which is journaled in a bearing opening 25' provided in thepartition wall Il. At the extremity ofthe shaft 23 to the left of thepartition wall I1, as viewed in Figure l, the same is provided with aclutch member F, which is formed integral therewith. The clutch member Fis providedwith a plurality of recesses 251-26 whichl cooperate with aclutch member E. To,the left of the clutch member F, the shaft 23 isprovided with a cylindrical bearing portion 2l, on which a worm wheel Bis rotatably journaled. The wormv wheel B meshesY with a driving wormmember C rotated by the operating hand wheel, ynot Shown. The clutchmember E is rotatable about the axis of the shaft 23 and is secured toan operating rod 28 extending through'the shaft 23 andvprojecting'beyondtheright-hand end of the same, as viewed in Figure 1, said projectingportion being disposed within the hollowboss 2 I. The project- Y ingportion last Vreferred to'has a spring cap 29 d xed thereto, withinwhich a clutch spring H is housed. The inner end Vof the clutch spring-H' bears directly on the extremityV of the shaft 23, thereby pullingtherod 28 to the right, as viewed in Figure l. At the outer end, that is,the lefthand end of the rod as viewed in Figure l, the same is providedwith an enlarged portion 30,

` which extends through an opening 3l in the cover member of thehousing. The inner end of the enlarged portion 3) of the rod is engagedwithin the clutch member E and is secured thereto by a transverselocking pin or rivet 32. As will be evident, the clutch member E is thussecured to the clutch operating rod 28 so as tobe reciprotremeright-hand position, as Viewed in Figure l, 4 by the clutch, spring H.The clutch member E has a pair of diametrically arranged, laterallyprojecting, clutch ngers or arms 5I'-6I, which are slidable withinopeningsrB2-62 provided in the worm wheel B and are engageable with therecesses 26-26 of the clutch memberF. An operating lever G is pivotallyconnected at the inner end to. a'collar or ring 33 which surrounds theouter end of the rod 28, the rod being headed, 55

modate the brake chain 35, which is connected to the brake mechanismproper, not shown, of the n car in the usual manner.

My improvements, comprise broadly a stop member K on the chain-Windingdrum and a co1 operating stop shoulder on the housing of the brakemechanism.

In carrying out my improvements, the innerl end-of the brake chain 35 isconnected to 'outstanding securing lugs formed on the chainwind ingdrum, by means of a connecting pin 36 extending through said lugs andthe innermost link of the chain 35, as shown in Figure 2. 'Ihe chain'-Winding drum has the stop member K pivoted thereto, the latter beingswingingly supported on the pin 36. The stop member K is provided Y witha stop face 37 at the right-hand side the-reof, as viewed in Figure 2,which cooperates with a transverse stop shoulder 38 formed by the wallsection 39 of the housing. VThe stop member K is of such a size thatwhen it is swunginwardly against the chain-winding drum it will clearthe wall 39 of the-housing so that the Winding drum may be rotated inlchain-Winding directionwithout interference. When the chain-winding drumis rotated in an unwinding direction, that is, in

a contra'clockwise direction, as viewed in Figure 2,

w; ing drum and preventing rewinding of the chain v*thereon due tospinning of the same.

The stop K Vis held in position against the drum by the chaink beingWound over the stop, thereby preventing contact with the shoulder 38until after the chain has been completely unwound, thus permitting thenecessary number of rotations of the drum to completely unwind thechain.

Y In the operation of my improved `hand brake mechanism, in applying the`brakes the worm. C is rotated to actuate the Worm Wheel B while theclutch fingers or arms of the clutch member E areheld in interlockingrelation with the notches of the clutch member F by means of the clutchspring H, thereby causing the chain- Winding drum to be rotated when thehand Wheel is actuated. To effect quick release of the brakes,

the cam lever G is pulled outwardly, thereby pulling the rod 28 to theleft, as Viewed in Figure l, against the tension of the spring H, andcarrying Vpointed out, in releasing the brakes rotation of the drum ispositively arrested and rewinding of the chain on the chain-winding drumis prevented bythe stop member K engaging the stop shoulder 38 o n thehousing.

I have herein shown and described what I now consider the preferredmanner of carrying out my invention, but the same is merely illustrativeand I contemplate all changes and modications that come within the scopeof the claims appended hereto.

I claim:

1. In a hand brake mechanism, the combination with a chain-Winding drum;of a brake chain connected to the drum; .operating means vforrotatingthe drum; a' gravity-influenced swinging stop member connected to thedrum; and stop shoulder means cooperating with said stop member to stoprotation of the drum when the brakes are completely released.

2. In a hand brake mechanism, the combinaconnected to the drum;operating means for rotating the drum; a gravity-inuenced, pivoted stopmember hung on the drum; and a housing enclosing said brake mechanism,said housing having ashoulder thereon cooperating with' said stop memberto stop rotation of the drum when the brakes are completely released.

3. In a hand brake mechanism, the combination with a support; of achain-Winding drum rotatably mounted on said support; a pivoted stopmember on the drum; a chain windable on the drum; anda xed stop shoulderon said'support engageable by said stop member for arresting.

rotation of the drum when the brakes are completely released, said chainwhen wound on the drumv swinging the stop member Yagainst the drum toclear said xed stop shoulder.

4. The combination with a ydrum and a cable therefor, of mechanism forpreventing reverse winding of the cable on the drum, comprising abracket carrying the mechanism, and a gravity actuated, pivoted latchlever and detent means carried by the bracket and the drum, .the leverbeing so located that it will be held in an inactive position until thelast convolution of cable is unwound from the drum.

. 4 STACY B.V HASELTINE.

